Finding the Fourth Proportional to 1,223.08, 1,823.89 and 1,090.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,223.08 : 1,823.89 = 1,090.30 : x
2. Step 2: Convert to fraction form
   1,223.08/1,823.89 = 1,090.30/x
3. Step 3: Cross multiply
   1,223.08x = 1,823.89 × 1,090.30
4. Step 4: Simplify right side
   1,223.08x = 1,988,587.27
5. Step 5: Solve for x
   x = 1,988,587.27/1,223.08
6. Step 6: Final answer
   x = 1,625.88